HL0276 ***********************************************************************
HL0276  DESIGNATION -  10520.2
HL0276  PID         -  HL0276
HL0276  STATE/COUNTY-  CO/SAN JUAN
HL0276  USGS QUAD   -  IRONTON (1990)
HL0276
HL0276                         *CURRENT SURVEY CONTROL
HL0276  ___________________________________________________________________
HL0276* NAD 83(1986)-  37 52 30.     (N)    107 43 54.     (W)     SCALED
HL0276* NAVD 88     -      3207.929  (meters)   10524.68   (feet)  POSTED
HL0276  ___________________________________________________________________
HL0276  GEOID HEIGHT-         -15.46  (meters)                     GEOID99
HL0276  DYNAMIC HT  -        3203.140 (meters)   10508.97  (feet)  COMP
HL0276  MODELED GRAV-     979,020.5   (mgal)                       NAVD 88
HL0276
HL0276  VERT ORDER  -  * POSTED, Code A , SEE BELOW
HL0276
HL0276.The horizontal coordinates were scaled from a topographic map and have
HL0276.an estimated accuracy of +/- 6 seconds.
HL0276
HL0276.The orthometric height was determined by differential leveling
HL0276.and adjusted by the National Geodetic Survey in 1992.
HL0276.* This is a POSTED BENCH MARK height.  Code A indicates a distribution
HL0276.rate of 0.0 thru 1.0 mm/km.
HL0276
HL0276.The geoid height was determined by GEOID99.
HL0276
HL0276.The dynamic height is computed by dividing the NAVD 88
HL0276.geopotential number by the normal gravity value computed on the
HL0276.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
HL0276.degrees latitude (G = 980.6199 gals.).
HL0276
HL0276.The modeled gravity was interpolated from observed gravity values.
HL0276
HL0276;                    North         East    Units  Estimated Accuracy
HL0276;SPC CO S     -   441,250.      718,090.      MT  (+/- 180 meters Scaled)
HL0276
HL0276                          SUPERSEDED SURVEY CONTROL
HL0276
HL0276  NGVD 29     -      3206.123  (m)        10518.76   (f) ADJ UNCH    1 2
HL0276
HL0276.Superseded values are not recommended for survey control.
HL0276.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
HL0276.See file dsdata.txt to determine how the superseded data were derived.
HL0276
HL0276_MARKER: Q = CHISELED SQUARE
HL0276_SETTING: 80 = SET IN A BOULDER
HL0276_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
HL0276+STABILITY: SURFACE MOTION
HL0276
HL0276  HISTORY     - Date     Condition        Recov. By
HL0276  HISTORY     - UNK      MONUMENTED       USGS
HL0276  HISTORY     - 1928     GOOD             NGS
HL0276  HISTORY     - 1985     MARK NOT FOUND   NGS
HL0276
HL0276                          STATION DESCRIPTION
HL0276
HL0276''DESCRIBED BY NATIONAL GEODETIC SURVEY 1928
HL0276''8.1 MI NW FROM SILVERTON.
HL0276''IN NORTHEAST ANGLE OF SWITCH BACK IN HIGHWAY, ON TOP OF BOULDER.
HL0276''BOULDER MARKED U.S.10520.2 B.M.
HL0276
HL0276                          STATION RECOVERY (1985)
HL0276
HL0276''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1985
HL0276''MARK NOT FOUND.